%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-1-16 on page I-268 in "Defining the item label (or title) and its design".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.0pt}
\sloppy %as the column in the book is so small
%StartShownPreambleCommands
\usepackage{enumitem}
\newlist{legal}{enumerate}{6}
\setlist[legal]  {format=\bfseries,label*=\arabic*.}
\setlist[legal,1]{label=\S\arabic*.}
%StopShownPreambleCommands

\begin{document}
We may want to enumerate items within a paragraph to
\begin{legal}
  \item save space
    \begin{legal}
      \item make a less prominent statement, or
      \item because
        \begin{legal}
          \item it's Friday \label{l1}
          \item we are bored
        \end{legal}
    \end{legal}
  \item or for some other reason.
\end{legal}
Show me: \ref{l1}
\end{document}
